MSM-Driver Front Riser Sensor Out Of Range Low

MSM-DRIVER FRONT RISER SENSOR OUT OF RANGE LOW





For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
Continuously.

- Set Condition:
This code is immediately set when the seat motor potentiometer feeds a value lower than the Memory/Heated Seat Adjustable Pedal Module has stored in EEPROM. Code will remain for 50 ignition cycles.





Diagnostic Test

1. STORED DTC
With the scan tool, erase the DTC from Memory/Heated Seat Adjustable Pedal Module (MHSAPM).
Operate the driver's power seat and memory system.
Turn the ignition switch to the Off position then start the engine and let run for one minute.
With the scan tool check for the same DTC to reset in the MHSAPM.
Did the same DTC reset?

Yes

- Go To2

No

- Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for an intermittent condition.
- PERFORM POWER SEAT SYSTEM VERIFICATION TEST - VER 1. Power Seat System Verification Test

2. (P29) DRIVER SEAT SENSOR 5 VOLT SUPPLY CIRCUIT OPEN




Ensure the MHSAPM is fully connected before proceeding.
Disconnect the Driver Front Riser Seat Position Sensor connector.
Turn ignition on.
Measure the voltage of the (P29) Driver Seat Sensor 5 Volt Supply circuit at front riser connector.
Is the voltage above 4.5 volts?

Yes

- Go To3

No

- Go To7

3. (P26) DRIVER FRONT RISER POSITION SIGNAL CIRCUIT OPEN




Turn ignition off.
Disconnect the Driver Front Riser Seat Position Sensor Connector.
Disconnect the Memory/Heated Seat Adjustable Pedal Module C2 Connector.
Measure the resistance of the (P26) Driver Seat Front Riser Position Signal circuit between the front riser sensor and the MHSAPM connector.
Is the resistance below 5.0 ohms?

Yes

- Go To4

No

- Repair the (P26) Driver Seat Front Riser Position Signal circuit for an open.
- PERFORM POWER SEAT SYSTEM VERIFICATION TEST - VER 1. Power Seat System Verification Test

4. (P26) DRIVER SEAT FRONT RISER POSITION SIGNAL CIRCUIT SHORT TO GROUND




Turn ignition off.
Disconnect the MHSAPM C2 connector.
Disconnect the Driver Front Riser Seat Position Sensor connector.
Measure the resistance of the (P26) Driver Seat Front Riser Position Signal circuit to ground.
Is the resistance below 1000 ohms?

Yes

- Repair the (P26) Driver Seat Front Riser Position Signal circuit for a short to ground.
- PERFORM POWER SEAT SYSTEM VERIFICATION TEST - VER 1. Power Seat System Verification Test

No

- Go To5

5. DRIVER FRONT RISER SEAT SENSOR LOW




Turn ignition off.
Ensure the MHSAPM is fully connected before proceeding.
Disconnect the Driver Front Riser Seat Position Sensor Connector.
Connect a jumper wire between (P29) Driver Seat Sensor 5 volt Supply and (P26) Driver Seat Front Riser Position Signal circuits.
Turn ignition on.
With the scan tool select MHSAPM Sensors.
Read the Driver Seat Front Riser Sensor voltage.
Is the voltage above 4.5 volts?

Yes

- Replace the Seat Track Assembly.
- PERFORM POWER SEAT SYSTEM VERIFICATION TEST - VER 1. Power Seat System Verification Test

No

- Go To6

6. MEMORY/HEATED SEAT ADJUSTABLE PEDAL MODULE
If there are no possible causes remaining, view repair.

Repair

- Replace the Memory/Heated Seat Adjustable Pedal Module.
- PERFORM POWER SEAT SYSTEM VERIFICATION TEST - VER 1. Power Seat System Verification Test

7. (P29) DRIVER SEAT SENSOR 5 VOLT SUPPLY WIRE OPEN




Turn ignition off.
Disconnect the MHSAPM C2 connector.
Disconnect the Driver Front Riser Seat Position Sensor connector.
Measure the resistance of the (P29) Driver Seat Sensor 5 Volt Supply wire between the Front Riser Sensor connector and the C2 connector.
Is the resistance below 5.0 ohms?

Yes

- Go To8

No

- Repair the (P29) Driver Seat Sensor 5 Volt Supply circuit for an open.
- PERFORM POWER SEAT SYSTEM VERIFICATION TEST - VER 1. Power Seat System Verification Test

8. (P29) DRIVER SEAT SENSOR 5 VOLT WIRE SHORT TO GROUND




Turn ignition off.
Disconnect the MHSAPM C2 connector.
Measure the resistance of the (P29) Driver Seat Sensor 5 volt supply circuit to body ground.
Is the resistance below 100.0 ohms?

Yes

- Repair the (P29) Driver Seat Sensor 5 Volt Supply circuit for a short to ground.
- PERFORM POWER SEAT SYSTEM VERIFICATION TEST - VER 1. Power Seat System Verification Test

No

- Go To9

9. MEMORY/HEATED SEAT ADJUSTABLE PEDAL MODULE
If there are no possible causes remaining, view repair.

Repair

- Replace the Memory/Heated Seat Adjustable Pedal Module.
- PERFORM POWER SEAT SYSTEM VERIFICATION TEST - VER 1. Power Seat System Verification Test